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Applications of Cathodoluminescence in Plasmonic Nanostructures and Ultrathin InAs Quantum Layers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Applications of Cathodoluminescence in Plasmonic Nanostructures and Ultrathin InAs Quantum Layers./
Author:	Yan, Qigeng.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	121 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-08, Section: B.
Contained By:	Dissertations Abstracts International82-08B.
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28260269
ISBN:	9798569964949

Applications of Cathodoluminescence in Plasmonic Nanostructures and Ultrathin InAs Quantum Layers.
Yan, Qigeng.

Applications of Cathodoluminescence in Plasmonic Nanostructures and Ultrathin InAs Quantum Layers. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 121 p.

Source: Dissertations Abstracts International, Volume: 82-08, Section: B.

Thesis (Ph.D.)--University of Arkansas, 2020.

This item must not be sold to any third party vendors.

Due to the advanced focusing ability, characterization methods based on the electron-beam excitation have been broadly applied to investigate nanomaterials. Structural or compositional information is commonly acquired using electron microscopes. Moreover, taking advantage of the super spatial resolution of the focused electron beam, optical properties of nanomaterials can be also obtained. Herein, general concepts and processes of the interaction between electrons and materials are studied. Two specific optical nanomaterials, including plasmonic nanostructures and semiconductor quantum layers, are investigated by the cathodoluminescence (CL) measurement.Surface plasmonic resonance can be generated when high-energy electrons strike the interface between the dielectric medium and plasmonic nanomaterials. It is found in our research that a special hybridized plasmonic resonance can be achieved by using a combination of multiple materials. Furthermore, a hybridized Au/Ag bullseye nanostructure has been designed and fabricated by the focused ion beam milling. Investigated by the CL process, we find that the hybridized plasmonic emission can be manipulated by the excitation position of the electron beam and the geometry of the bullseye pattern. Finally, we move forward to apply the electron-beam excitation to investigate topological insulators, which are possible to support surface plasmonic waves. A new tip plasmon emission is excited due to the charge oscillation in Bi2Te3 nanotips. Plasmonic properties of Bi2Te3 nanostructures relate to the lateral size, excitation location and resonant wavelength. Finally, based on the application of hybrid plasmonic structures and resonance between edges, nanosphere heterodimers are expected to broaden the usage of plasmonic materials. Investigated by the numerical simulation, an enhanced hotspot emission is observed with a broad wavelength range. The plasmonic behaviors depend on the composition and structural size.As high energy incident electrons excite electrons from valence bands to conduction bands by secondary processes, we investigated high quality ultrathin InAs layers in InAs/GaAs heterostructures. The CL measurement reveals the formation of In rich clusters for sub monolayers. The electron beam excitation provides a better spatial resolution to observe the variation of CL signal at different locations. The CL peak position, linewidth, and intensity relate to the thickness and roughness of ultrathin layers.

ISBN: 9798569964949Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

Quantum well

Applications of Cathodoluminescence in Plasmonic Nanostructures and Ultrathin InAs Quantum Layers.
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245 1 0 $a Applications of Cathodoluminescence in Plasmonic Nanostructures and Ultrathin InAs Quantum Layers.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 121 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-08, Section: B.
500 $a Advisor: Salamo, Gregory.
502 $a Thesis (Ph.D.)--University of Arkansas, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Due to the advanced focusing ability, characterization methods based on the electron-beam excitation have been broadly applied to investigate nanomaterials. Structural or compositional information is commonly acquired using electron microscopes. Moreover, taking advantage of the super spatial resolution of the focused electron beam, optical properties of nanomaterials can be also obtained. Herein, general concepts and processes of the interaction between electrons and materials are studied. Two specific optical nanomaterials, including plasmonic nanostructures and semiconductor quantum layers, are investigated by the cathodoluminescence (CL) measurement.Surface plasmonic resonance can be generated when high-energy electrons strike the interface between the dielectric medium and plasmonic nanomaterials. It is found in our research that a special hybridized plasmonic resonance can be achieved by using a combination of multiple materials. Furthermore, a hybridized Au/Ag bullseye nanostructure has been designed and fabricated by the focused ion beam milling. Investigated by the CL process, we find that the hybridized plasmonic emission can be manipulated by the excitation position of the electron beam and the geometry of the bullseye pattern. Finally, we move forward to apply the electron-beam excitation to investigate topological insulators, which are possible to support surface plasmonic waves. A new tip plasmon emission is excited due to the charge oscillation in Bi2Te3 nanotips. Plasmonic properties of Bi2Te3 nanostructures relate to the lateral size, excitation location and resonant wavelength. Finally, based on the application of hybrid plasmonic structures and resonance between edges, nanosphere heterodimers are expected to broaden the usage of plasmonic materials. Investigated by the numerical simulation, an enhanced hotspot emission is observed with a broad wavelength range. The plasmonic behaviors depend on the composition and structural size.As high energy incident electrons excite electrons from valence bands to conduction bands by secondary processes, we investigated high quality ultrathin InAs layers in InAs/GaAs heterostructures. The CL measurement reveals the formation of In rich clusters for sub monolayers. The electron beam excitation provides a better spatial resolution to observe the variation of CL signal at different locations. The CL peak position, linewidth, and intensity relate to the thickness and roughness of ultrathin layers.
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650 4 $a Plasma physics. $3 3175417
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653 $a Surface plasmon
653 $a Electron-beam excitation
653 $a Nanomaterials
653 $a Optical properties
653 $a Plasmonic nanostructures
653 $a Semiconductor quantum layers
653 $a Cathodoluminescence (CL) measurement
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710 2 $a University of Arkansas. $b Physics. $3 2094009
773 0 $t Dissertations Abstracts International $g 82-08B.
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28260269